I could prowl you could prowl he could prowl we could prowl you could prowl they could prowl
V-ing form
I could be prowling you could be prowling he could be prowling we could be prowling you could be prowling they could be prowling
Perfect
I could have prowled you could have prowled he could have prowled we could have prowled you could have prowled they could have prowled
V-ing perfect
I could have been prowling you could have been prowling he could have been prowling we could have been prowling you could have been prowling they could have been prowling
Negation
Simple form
I could not prowl you could not prowl he could not prowl we could not prowl you could not prowl they could not prowl
V-ing form
I could not be prowling you could not be prowling he could not be prowling we could not be prowling you could not be prowling they could not be prowling
Perfect
I could not have prowled you could not have prowled he could not have prowled we could not have prowled you could not have prowled they could not have prowled
V-ing perfect
I could not have been prowling you could not have been prowling he could not have been prowling we could not have been prowling you could not have been prowling they could not have been prowling
Interrogative form
Simple form
could I prowl? could you prowl? could he prowl? could we prowl? could you prowl? could they prowl?
V-ing form
could I be prowling? could you be prowling? could he be prowling? could we be prowling? could you be prowling? could they be prowling?
Perfect
could I have prowled? could you have prowled? could he have prowled? could we have prowled? could you have prowled? could they have prowled?
V-ing perfect
could I have been prowling? could you have been prowling? could he have been prowling? could we have been prowling? could you have been prowling? could they have been prowling?
Interro-negative form
Simple form
could I not prowl? could you not prowl? could he not prowl? could we not prowl? could you not prowl? could they not prowl?
V-ing form
could I not be prowling? could you not be prowling? could he not be prowling? could we not be prowling? could you not be prowling? could they not be prowling?
Perfect
could I not have prowled? could you not have prowled? could he not have prowled? could we not have prowled? could you not have prowled? could they not have prowled?
V-ing perfect
could I not have been prowling? could you not have been prowling? could he not have been prowling? could we not have been prowling? could you not have been prowling? could they not have been prowling?